The Norwegian sleeper trains are CNL-level, I'd say. There are brand new ones due to the Caledonian Sleeper routes in the UK (strictly speaking, there are three sleeper routes, with a total of 6 termini from London).
But it's not surprising there are massive cutbacks. These things are expensive to run - high staff-to-passenger ratio, particularly when you take signalling and station opening into account, and lots of idle time.
I do hope OEBB takes on some of the routes, as discussed.